** FILE ** Juan Martin del Potro of Argentina hits a forehand to Spain's Rafael Nadal during their semifinals match at the U.S. Open tennis tournament in New York on Sunday, Sept. 13, 2009. (AP Photo/Charles Krupa)
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** FILE ** Juan Martin del Potro of Argentina hits a forehand to Spain's Rafael Nadal during their semifinals match at the U.S. Open tennis tournament in New York on Sunday, Sept. 13, 2009. (AP Photo/Charles Krupa)
